GE Series 90-30 PLC

A-2 Series 90-30 PLC Installation and Hardware Manual – August 2002 GFK-0356Q
A
Cable and Connector Specifications
The cable assembly presents one of the most common causes of communication failure. For best
performance construct the cable assemblies according to the recommended connector parts and
specifications.
Table A-1. Connector/Cable Specifications
Item Description
Series 90 PLC: Serial (RS-422) port with metric hardware
Connector: 15-pin male, D-Subminiature Type, Cannon DA15S (solder pot) Hood: AMP
207470-1 connector shell
Hardware Kit: AMP 207871-1 Kit includes 2 metric screws and 2 screw clips
Workmaster II: Serial (RS-232) port with standard RS-232 connector
Mating
Connectors:
Connector: 25-pin female, D-Subminiature Type, Cannon DB25S (solder pot) with
DB110963-3 hood or equivalent (standard RS-232 connector)
Workmaster: Serial (RS-232) port with standard RS-232 connector
Connector: 9-pin female, D-Subminiature Type, Cannon DE9S (solder pot) with DE110963-1
hood or equivalent (standard RS-232 connector)
IBM-AT/XT: Serial (RS-232) port with standard RS-232 connector
Connector: 9-pin female, D-Subminiature Type, Cannon DE9S (solder pot) with DE110963-31
hood or equivalent (standard RS-232 connector)
RS-232/RS-485 Converter: one 15-pin male, and one 25-pin male
connector
15-pin male connector requires metric hardware (same connector, hood, and hardware as for
Series 90 PLC listed above)
25-pin male D-Subminiature Type, Cannon DA25S (solder pot) with DB110963-3 hood or
equivalent (standard RS-232 connector)
Computer grade, 24 AWG (.22 mm
2
), minimum with overall shield
Catalog Numbers: Belden 9505, Belden 9306, Belden 9832
Cable: These cables provide acceptable operation for data rates up to 19.2 Kbps
as follows:
RS-232: 50 feet (15 meters) maximum cable length
RS-422/RS-422: 4000 feet (1200 meters) maximum length. Must not
exceed the maximum RS-422 Common Mode specifi-
cation of +7V to -7V. Isolation at the remote end may
be used to reduce or eliminate Common Mode voltages.
For distances under 50 feet (15 meters), almost any twisted pair or shielded twisted pair cable
will work, as long as the wire pairs are connected correctly.
When using RS-422/RS-422, the twisted pairs should be matched so that both transmit signals
make up one twisted pair and both receive signals make up the other twisted pair. If this is
ignored, cross-task resulting from the mismatching will affect the performance of the
communications system.
When routing communication cables outdoors, transient suppression devices can be used to
reduce the possibility of damage due to lightning or static discharge.
Care should be exercised that all connected devices are grounded to a common point.
Failure to do so could result in damage to the equipment.